Al-Adab Al-Mufrad, Book 1, Hadith 40 (English) ⓘ

'Abdullah ibn Dinar reported that Ibn 'Umar passed by a bedouin during a journey. The bedouin's father had been a friend of 'Umar's. The bedouin said, "Am I not the son of so-and-so?" He said, "Yes, indeed." Ibn 'Umar ordered that he be given a donkey which was following him. He also took off his turban and gave it to him, One of the men with him said, "Wouldn't two dirhams be enough for him?" He replied, "The Prophet, may Allah bless him and grant him peace, said, 'Maintain what your father loved. Do not cut it off so that Allah puts out your light."

حَدَّثَنَا عَبْدُ اللهِ بْنُ صَالِحٍ قَالَ‏:‏ حَدَّثَنِي اللَّيْثُ، عَنْ خَالِدِ بْنِ يَزِيدَ، عَنْ عَبْدِ اللهِ بْنِ دِينَارٍ، عَنِ ابْنِ عُمَرَ‏:‏ مَرَّ أَعْرَابِيٌّ فِي سَفَرٍ، فَكَانَ أَبُو الأعْرَابِيِّ صَدِيقًا لِعُمَرَ رَضِيَ اللَّهُ عَنْهُ، فَقَالَ لِلأَعْرَابِيِّ‏:‏ أَلَسْتَ ابْنَ فُلاَنٍ‏؟‏ قَالَ‏:‏ بَلَى، فَأَمَرَ لَهُ ابْنُ عُمَرَ بِحِمَارٍ كَانَ يَسْتَعْقِبُ، وَنَزَعَ عِمَامَتَهُ عَنْ رَأْسِهِ فَأَعْطَاهُ‏.‏ فَقَالَ بَعْضُ مَنْ مَعَهُ‏:‏ أَمَا يَكْفِيهِ دِرْهَمَانِ‏؟‏ فَقَالَ‏:‏ قَالَ النَّبِيُّ صلى الله عليه وسلم‏:‏ احْفَظْ وُدَّ أَبِيكَ، لاَ تَقْطَعْهُ فَيُطْفِئَ اللَّهُ نُورَكَ‏.‏